How would you classify this?
http://www.youtube.com/watch?v=GQVTtpE9J7s
Deep Purple became famous with Hush, originally written and recorded by Billy Joe Royal. Hendrix found fame and fortune on the back of Hey Joe, a traditional song originally written by no one really knows but recorded earlier by the Byrds and Love. The Animals also came into the public gaze with House Of The Rising Sun, also a traditional, no one knows who originally wrote it, American ballad. Cream were mostly a covers band. The list is endless of bands who many think are original but have been covering songs by others.